The Margin property, used by many controls to specify a margin around the outside of the control, is inherited from the FrameworkElement class. The Margin property’s type is Thickness, which is a structure.

The Thickness structure has four fields, defining the size of the margin along each edge of the control: Left, Top, Right, Bottom. The value of each of these fields is specified in device independent WPF Units.

You can specify a Thickness value in XAML by listing the four values in a comma-separated string, in the following order: “left, top, right, bottom”.

<Image Name="imgKlondike" Source="TractorSm.png" Margin="5,10,5,10"/>

You can also change the value of a Margin in code. You can’t set individual fields in the margin, but you can set the property to a new instance of a Thickness.